Structure and seismic stratigraphy of the Griptarane area, Moere Basin margin, mid-Norway continental shelf

• Published in: Marine geology Vol. 147; no. 1-4; pp. 85 - 107
• Main Authors: Boee, R, Skilbrei, J R
• Format: Journal Article
• Language: English
• Published: 01.05.1998
• Subjects: Marine; ANE, Norway, Griptarane
• ISSN: 0025-3227

The Mesozoic succession on the landward side of Griptarane, offshore mid-Norway, reflects an upward change from Lower Jurassic alluvial deposits to Middle Jurassic marine/continental deposits into Upper Jurassic-Lower Cretaceous marine deposits. In the latest Jurassic there was deposition of submarine fans along faults associated with major extensional deformation and fault block rotation, probably in Volgian times. This phase coincided with NW-SE extension and rifting in the Sloerebotn Sub-basin and at Haltenbanken. An onlap surface is interpreted to represent the Kimmerian unconformity and to mark the approximate position of the Jurassic-Cretaceous boundary. Some WNW-ESE- to E-W-oriented faults exhibit reverse movements, while E-W-trending folds indicate N-S compression. This compression is interpreted to coincide with a late Early Cretaceous phase of sinistral transpression in the Gossa High and Sloerebotn Sub-basin, and inversion and doming in the Moere and Voering Basins. The predominance of WNW-ESE- to NW-SE- and ENE-WSW- to NE-SW-trending structures indicates that the Griptarane area has been influenced by the stress regimes of the Moere-Troendelag Fault Complex as well as the stress regimes in the regions further offshore.